142 Miscellaneous Intelligeiice. 



I. - 



Chemistry and Mineralogy. 



On the Detection of Organic Masm in the Air. By George C. Sch.aeffee, Prof, 

 of Chemistry and Natural Philosophy, Centre College, Danville, Ky, 



On the Cause of Saltpetre Explosions. Bj Geokge C. Schaeffer, Danville, Ky. 



On the Chemical Effects produced by feeble electrical cuiTcnts. By Daniej:. 

 Vaughan. 



Oq the existence of Phosphorus in certain Des Moines Iron Stones. By Doct. D. 

 D. OvTENj U. S. Geologist of the Cliippewa Land District. 



On the Association of certain Minerals m Korthern New York. By Fraxklix B. 

 Hough, M.D. 



Geology. 



Results of an Exploration of the Coral Reefs of Florida, in connection with the 

 XT. S. Coast Survey. By Prof. L. Agassiz, of Harvard. 



On the Post-Permian date of the Red Sandstone Rocks of New Jersey, and the 

 Connecticut Valley, as shown by fossil remains. By W. C. Redfield, of New York* 



On the Fossil Rain-marks in the Red Sandstone Rocks of New Jersey and Con- 

 necticut, and their authentic character. By "W. C. Redfield, of New York. 



Parallelism of the Paleozoic Rocks of New York with those of the Western 

 States, and of all these with the Palaeozoic strata of Em-ope. By Prof. James Hall, 



On the Silurian Rocks of the Lake Superior Land District. By Prof James Hall, 

 Palaeontologist of the Survey. 



On the Number and Distribution of Fossil Specuncns in the Palaeozoic Rocks of 

 Iowa, "Wisconsin, and Minnesota. By Drs. D. D. Owen, and B. Schumard, of New 

 Harmony, Tnd. 



On the False ontologj' of the Lowest Sandstones of "Wisconsin, Iowa, and ilin- 

 nesota. By D. D. Owen, M.D. 



Abstract of an Introduction to the final Report on the Geological Surveys made 

 in "Wisconsin, Iowa, and Minnesota, in the years 184Y-8-9 and 50, contaiug a Synop- 

 sis of the Geological features of the country. By D. D. Owex. 



On the Azoic System of Lake Superior. By Messrs. Fostek and "Whitney, IT. S. 

 Geologists of the Lake Superior Land District. 



On the age of the Sandstone of Lake Superior, with a description of the phe- 

 nomena of the associated igneous rocks. By Messrs. Foster and Whitney. 



On the different Systems of Elevation which have given configuration to North 

 America. By J. "W. Fosteu, U.S. Geologist for the Land District of Lake Superior. 



On the Superficial Deposits of the North-"West. By Chaules "Whittlesey, of the 

 U. S. Geological Survey of Lake Superior. 



On the Equivalency of the Rocks of North Eastern Ohio and the Portage, Che- 

 imnig and Hamilton Rocks of New York. By Charles "Whittlesey, Esq. 



On the Goniatite Limestone of the Black Slate of Rockford, Jackson County, 

 Indiana. By D. Christ r, of Oxford, Ohio. 



On Quartz Pebbles m the Sandstone Conglomerate, and Reasons for rejecting the 

 Theory of "Water Detrition. Bv Prof. J. Brainerd, of Cleveland. 



Notes on the Suivey of the Boundary betweeen the United States and Mexico. 

 By Maj. W. W. Emory, 



On the law of deposit by the flood tide. By Lieut, Charles H. Davis, U.S.If'j 

 Superintendent of the American Nautical Almanac 



Report of the Committee appomted to memorialize the Legislature of Pennsy^ 

 vania in reference to the publication of the fimd geological report of that State. 

 By Solomon "W. Roberts, Civil Engineer. 



Zoology and Botany. 



On the limits of the class of Polypi and the rank and succession of their chief 

 natural divisions. By Prof L. Agassiz, of Harvard. 



On some Points of the Structure and Reproduction of Physalia. By Prof Jj- 

 Agassiz. 



On the special Homologies of the true Star Fishes and Crinoids. By Prof. L. Agassis 



On the special Homologies of Acepliala. By Prof L. Agassiz. 



Report on the Vertebrate fossils exliibited before the Association. By ProL L- 

 Agassiz. 



